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In this paper, the requirements for next generation passive optical network (NG-PON) and evolution trends of PON are analyzed. Based on the analysis of the requirements for NGPON and the characteristics of various potential NG-PON schemes, it is believed that hybrid TDM/WDM PON will be the most promising candidate NG-PON schemes for different application scenes in the near future, and the OFDM PON...
We present the use of an ultra-narrow spectrum-sliced incoherent light source for transmission of 10-Gb/s non-return-to-zero signals for wavelength-division-multiplexed passive optical networks. In this light source, a broadband amplified spontaneous emission noise is spectrum-sliced by an ultra-narrow filter and then fed to a gain-saturated semiconductor optical amplifier to suppress the excess intensity...
We report a FDML swept laser based on Bi-EDF fiber for the first time. A sweeping bandwidth of 81 nm is achieved. In vivo OCT imaging is presented to justify the feasibility of this work.
The MODE-GAP project was established to identify the optimum fiber type for use beyond the capacity crunch. This paper will review some of the key drivers behind the project and analyze the key limits and potential improvements‥
Mixed-line-rate and mixed formats (MLR-MF) WDM optical networks can assign distinct bit rates and/or modulation formats to different lightpaths. In this paper, we compare MLR and SLR (single line rate, all the channels with the same line rate) configurations. The goal is to investigate the tradeoffs between blocking probability and power consumption. It is demonstrated that a MLR scheme can provide...
Passive Optical Networks (PONs) are attractive fiber-based access systems providing broadband access solutions at a low cost. A hybrid Wavelength Division Multiplexing (WDM) — Time Division Multiple Access (TDMA) PON is a favorite PON configuration, in which the researchers have drawn much attention. We have analysed and proposed several protocols for dynamic wavelength allocation in a WDM-TDMA PON,...
This study presents a wavelength division multiplexing multi-ring architecture for metropolitan area networks (MANs). An asynchronous transmission WDMA protocol is introduced that serves the variable size of Internet packets in nowadays ring MANs under asymmetric traffic scenarios. Especially, the proposed WDMA protocol takes under consideration the time sensitivity of Internet traffic and each time...
In this paper, we describe the physical layer technologies, which should enable to still increase the global capacity of the currently deployed 100 Gbps WDM transmission systems, while making more flexible and more energy-efficient the optical transport networks. We address, in particular, the networks which will dynamically adapt their capacity to the service connection requirements, thanks to the...
We present an experimental analysis on externally seeded colourless transmitters for WDM PON. We take advantage of direct modulation of a high performance MQW RSOA. Chirp is analysed as main limiting factor to SSMF propagation at 10 Gb/s. We demonstrate that off-set filtering performed by the OLT demultiplexer allows to cope with chromatic dispersion impairments and to bridge 24-km SSMF at 10 Gb/s...
Digitally processed modulations formats such as Nyquist-WDM are investigated for implementation of future flexible optical networks, by using integrated photonic devices and moderate speed optoelectronics. We compare with other modulation formats as OFDM regarding complexity and adaptability to transceiver limitations.
Current communication environments present a wide range of traffic granularities, making it hard to use the optical spectrum efficiently under the WDM framework. In elastic networking, the WDM rigid frequency grid is replaced by a more flexible structure, in which the spectrum is organized in frequency slots, and each traffic flow is assigned to an appropriate set of contiguous slots. The classical...
The wavelength-division-multiplexed passive optical network (WDM PON) is very attractive for the future broadband access network due to its capability of providing practically unlimited bandwidth to each subscriber. However, for the massive commercial deployment, its competitiveness is yet to be improved. In particular, we need to increase its operating speed and maximum reach, and, at the same time,...
Current passive optical networks (PONs) (Gigabit PON (GPON) and Ethernet PON (EPON)) will run out of bandwidth sooner or later due to the ever increasing bandwidth demand. These standards and the new next generation (NG-PON) standards (10 Gigabit-PON (XG-PON) and 10 Gigabit Ethernet-PON (10G-EPON)) are based on time division multiplexing (TDM-PON) which also has its limitations. In this paper hybrid...
We demonstrate the first real-time high-capacity star OFDM-based all-optical intra-data center network using burst switching and OpenFlow-based software-defined networking. It offers efficient flexible bandwidth multi-vendor any-to-any switching and hitless in-service upgrade.
An OFDM-based all-optical intra-data center network architecture without optical or electrical switches is described. It offers large capacity any-to-any switching with flexible fine granular bandwidth sharing, low power, low cost, and software-defined centralized control.
We propose a highly efficient, fully elastic all-optical network based on Nyquist OTDM-WDM, and demonstrate the transmission and pass-drop operations of multi-granular signals from 43Gbaud to dual-polarization 344Gbaud over 320-km SLA-IDF with four WSS nodes.
We experimentally demonstrate the compression of a dense wavelength-division multiplexing (DWDM) grid via a spectral imaging system based on two time-lenses. A 100-GHz DWDM-grid is compressed to 50-GHz with error-free performance for all channels.
We propose a ranging method for λ-tunable WDM/TDM-PONs enabling dynamic wavelength and bandwidth allocation with accurate round-trip times without re-ranging regardless of changes in wavelength assignment. Its effect on upstream bandwidth allocation is theoretically evaluated.
Elastic Optical Networking (EON) is a solution that promises to improve infrastructure utilisation by implementing flexible spectrum allocation with small spectrum slots instead of the rigid 50-GHz fixed grid of current DWDM deployments. This new EON flexible grid supports Bandwidth Variable Transponders (BVT) that can tune their bit rate and bandwidth dynamically with a trade off between reach and...
We experimentally demonstrate a bi-directional Terabit+ UDWDM coherent PON with Nyquist shaped 16QAM modulation, offering up to 10 Gb/s service capabilities per user/wavelength in a total spectrum of 12.8 nm over 40 km of SSMF.
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